Wikipedia - Thai League 3

Thai League 3 (Thai: ไทยลีก 3), commonly known as the T3, is the third level of Thai football. It was started in 2017 First season. It is sponsored by BYD Auto and therefore officially known as the BYD Dolphin League III. In 2017, the League is divided in 2 regions and participated by 32 clubs 1st-4th clubs from 8 regions which are former members Regional League Division 2 and debutants in the season.

Thailand Division 3 is a competitive football tournament that serves as a vital platform for emerging clubs and local teams across Thailand. Organized under the auspices of the Thai Football Association, this division aims to foster grassroots development and provide opportunities for talented players to showcase their skills. Featuring a dynamic league format, Thailand Division 3 brings together teams from various regions, promoting regional rivalries and community engagement. The tournament not only offers a pathway for promotion to higher divisions but also contributes to the overall growth and popularity of football in Thailand. With passionate fans and a focus on developing local talent, Thailand Division 3 is an exciting stepping stone in the Thai football hierarchy.